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Dear Frank,

You wrote:

> Using lunars, I made an arc
> error table that had a maximum value
> of 1.8 minutes of arc.

and then:

> eccentricity problem amounting to
> as much as 0.8 minutes of arc.

Of course, there would be no difficulty to detect such
large errors using either Lunars or stars distances.
By the way, this shows that the
sextants you experimented with
were of poor quality.
The arc error of a good sextant is not supposed to change
by 1'8 even if you ship it or transport in a car, is it?

When, answering George's question, I said that
"I failed", I was talking about STAR-STAR distances
only. Which are less precise than the Lunars.
My Sun- and Jupiter- Lunars
(taken in long series and averaged) generally
agree with the most recent certificate I have within
0'2. As you can see from the statistics I posted on
my web site. Determining the arc correction from Lunars
is a long-term enterprize, this cannot be done in one night.
So this procedure would be pretty useless in practice,
if the arc error changes during a car transportation.
Fortunately, in my sextant it does not seem to change:
I transported it a lot by cars, trains and airplanes
(in the luggage). Even IC does
not seem to change much. It is between -0.3 and -0.5
since I bought it.

Alex.


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